Preparation of high bulk density anhydrous sodium carbonate crystals
Patent 4738836 Issued on April 19, 1988. Estimated Expiration Date: 
October 27, 2006. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
October 27, 2006. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 1992532 2442584 3459497 3705790 3725014 3796794 3838189 3870780 Recovery of soda values from sodium carbonate crystallizer purge liquors Producing sodium carbonate monohydrate from carbonate solution including addition of aluminum ions InventorsAssigneeApplicationNo. 06/923249 filed on 10/27/1986US Classes:423/206.2, Alkali carbonate from trona23/302T, Sodium compounds423/421Alkali metal containing (Li, Na, K, Rb, or Cs)ExaminersPrimary: Straub, Gary P.Attorney, Agent or FirmInternational ClassesC01D 7/00 (20060101)C01D 7/24 (20060101) C01D 7/26 (20060101) C01D 7/37 (20060101) AbstractSodium carbonate having a high bulk density and pseudo-cubic crystal structure is prepared from impure trona purge liquors from the crystallizers containing high concentration of organics, silica and sulfate by a sequence of steps involving (1) treatment of the liquors with MgO; (2) separation of the treated liquor from the insoluble reaction products; (3) addition of Ca and Mg compounds to the liquor; (4) evaporating the solution to obtain sodium carbonate monohydrate crystals; (5) separating the crystals from the mother liquor; and (6) heating the crystals at temperature of about 150°-200° C. to convert to dense ash. |
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